modded / repack version
It sounds like you’re referring to a specific of Ultra Street Fighter IV for PC, often labeled “Reloaded 2014 PC Exclusive.” This is not an official Capcom release, but rather a cracked/pirated repack (likely from the scene group RELOADED ) that appeared around 2014.
Red Focus
: A new mechanic that allows players to absorb multiple hits using two bars of meter.
The New Roster
Zero input delay.
Players praise the "Exclusive" experience for one reason above all others: It remains the smoothest version of Street Fighter IV ever coded, even eclipsing the native Street Fighter 6 drive system for raw responsiveness.